EPA has signed an Administrative Settlement Agreement and Order on Consent (Settlement Agreement) with the Boston & Maine Corporation (B&M) and the Massachusetts Bay Transportation Authority (MBTA) in connection with Operable Unit 4 of the Iron Horse Park Superfund Site in Billerica, Massachusetts (Site). The Settlement Agreement provides that B&M and MBTA will perform sediment sampling in the Boston & Maine Pond located on the Site. The Site is a 553-acre industrial complex which includes manufacturing and rail yard maintenance facilities, open storage areas, landfills, and former wastewater lagoons.